JP2011527081A - Code protector for power tools - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a code protector for a power tool.
A power tool includes a housing, a motor disposed in the housing, a power cord connected to the motor, and a cord protector that is operatively engaged with the power cord in accordance with its movement. Yes. The cord protector is engaged with the power cord and biases the power cord with respect to the load being applied to the power cord and returns at least one to an initial position for removal of the load. Two elastically deformable bias members may be provided.
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Description

  This application includes US patent application Ser. No. 12 / 164,584 filed Jun. 30, 2008, US Patent Application Ser. No. 12 / 164,621 filed Jun. 30, 2008, and 2008. This is a PCT international application related to US patent application Ser. No. 12 / 164,650 filed on June 30th. Each is a continuation-in-part of US patent application Ser. No. 11 / 860,989 filed on Sep. 25, 2007. And it claims the benefit of US Provisional Application No. 60 / 863,467, filed Oct. 30, 2006. The disclosure of which is incorporated herein by reference.

  The present disclosure relates to various improvements in power tools, and in particular to a cord set load protector.

  The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

  A common field failure with heavier portable power tools, such as portable saws, is the separation of the power cord from the tool by an impulse load or jerk applied to the cord. Power when the tool falls while the plug end of the power cord is fixed, or when the user carries the tool, or when it is lowered from floor to floor or under a ladder By having code, this can happen.

  In order to decouple the power cord conductor or connection from the strong forces imposed by jerking the power cord, the power cord according to the present disclosure has a small service loop or additional length of cable And installed in the tool housing between the cord clamp and the portion of the tool housing that secures the cord protector. A crimp-on device is installed on the power cord cable following the cord protector. As the cord is exposed to jerking, the cable moves axially relative to the cord protector. As the cable moves, the crimping device absorbs the energy conducted to the leads or connections of the cord set located within the housing and compresses the extended end of the cord protector that reduces the force.

  Further scope of applicability will become apparent from the specification provided herein. It should be understood that the specification and specific examples are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

  The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.

FIG. 1 is a perspective view of an exemplary worm drive saw having a tool hanger according to the principles of the present disclosure. FIG. 2 is a cross-sectional view showing a cord set load protector according to the principles of the present disclosure in an unloaded state. FIG. 3 is a drawing similar to FIG. 2 with the load applied to the cord. FIG. 4 is a perspective view of an exemplary cord clamp utilized by a cord set load protector according to the principles of the present disclosure. FIG. 5 is a perspective view of the first clamp half. FIG. 6 is a perspective view of the second clamp half. FIG. 7 is a perspective view of a cordset load protector design with a partially removed handle according to some embodiments for convenience of explanation. FIG. 8 is a perspective view of a cordset load protector design according to some embodiments having a serpentine pattern. FIG. 9 is a front view of the cord set load protector design according to FIG. 8 in the initial position. FIG. 10 is a front view of the cord set load protector design according to FIG. 8 in a biased position. FIG. 11 is a perspective view of a cord set load protector design according to some embodiments having an engagement plate. 12 is a front view of the cord set load protector design according to FIG. 11 in the initial position. FIG. 13 is a front view of the cord set load protector design according to FIG. 11 in a biased position. FIG. 14 is a front view of an initial position cordset load protector design according to some embodiments having an engagement plate. FIG. 15 is a front view of the cord set load protector design according to FIG. 14 in a biased position. FIG. 16 is a perspective view of a cord set load protector design according to some embodiments having a biasing member disposed therein. FIG. 17 is a front view of the cord set load protector design according to FIG. 16 in the initial position. 18 is a front view of the cord set load protector design according to FIG. 16 in a biased position. FIG. 19 is a front view of an initial position codeset load protector design according to some embodiments. FIG. 20 is a front view of the cord set load protector design according to FIG. 19 in a biased position. FIG. 21 is a front view of an initial position codeset load protector design according to some embodiments. 22 is a front view of the cord set load protector design according to FIG. 21 in a biased position. FIG. 23 is a front view of an initial position cordset load protector design according to some embodiments having extension springs. FIG. 24 is a front view of the cord set load protector design according to FIG. 23 in a biased position. FIG. 25 is a front view of an initial position cordset load protector design according to some embodiments having a tension spring. FIG. 26 is a front view of the cord set load protector design according to FIG. 25 in a biased position. FIG. 27 is a front view of an initial position cordset load protector design according to some embodiments having leaf springs. FIG. 28 is a front view of the cord set load protector design according to FIG. 27 in a biased position. FIG. 29 is a front view of an initial position cordset load protector design according to some embodiments having a torsion spring. FIG. 30 is a front view of the cord set load protector design according to FIG. 29 in a biased position. FIG. 31 is an enlarged perspective view of the bias member of FIG. FIG. 32 is a front view of an initial position codeset load protector design according to some embodiments having a tether system. FIG. 33 is a front view of the cord set load protector design according to FIG. 32 in a biased position. FIG. 34 is a front view of an initial position cordset load protector design according to some embodiments having a piston device. FIG. 35 is a front view of the cord set load protector design according to FIG. 34 in a biased position. FIG. 36 is a front view of an initial position codeset load protector design according to some embodiments having a piston device and an orifice channel. FIG. 37 is a front view of the cord set load protector design according to FIG. 36 in a biased position. FIG. 38 is a front view of an initial position cordset load protector design according to some embodiments having a spring lever. FIG. 39 is a front view of the cord set load protector design according to FIG. 38 in a biased position. FIG. 40 is a front view of an initial position cordset load protector design according to some embodiments having a spring lever and an additional spring. 41 is a front view of the cord set load protector design according to FIG. 40 in a biased position. FIG. 42 is a front view of an initial position cordset load protector design according to some embodiments having a spring lever and a torsion spring. 43 is a front view of the cord set load protector design according to FIG. 42 in a biased position. FIG. 44 is a perspective view of a cord set load protector design according to some embodiments having a spring lever and cord clamp. FIG. 45 is a perspective view of the spring lever. FIG. 46 is a perspective view of the cord clamp. FIG. 47 is a front view of an initial position cordset load protector design according to some embodiments having a spring member. FIG. 48 is a front view of the cord set load protector design according to FIG. 47 in a biased position. FIG. 49 is a front view of an initial position codeset load protector design according to some embodiments having a biasing media. FIG. 50 is a front view of the cord set load protector design according to FIG. 49 in a biased position. FIG. 51 is a front view of an initial position cordset load protector design according to some embodiments having a coil spring. FIG. 52 is a front view of the cord set load protector design according to FIG. 51 in a biased position. FIG. 53 is a front view of an initial position cord set load protector design according to some embodiments having a spring lever. 54 is a front view of the cord set load protector design according to FIG. 53 in a biased position. FIG. 55 is a front view of an initial position cordset load protector design according to some embodiments having a breakaway connection. FIG. 56 is a front view of the cord set load protector design according to FIG. 55 in a biased position. FIG. 57 is a perspective view of a cordset load protector design according to some embodiments having a cam follower. FIG. 58 is a front view of the cord set load protector design according to FIG. 57 in the initial position. FIG. 59 is a front view of the cord set load protector design according to FIG. 57 in a biased position. FIG. 60 is a perspective view of a cord set load protector design according to some embodiments having an initial position cam follower. 61 is a perspective view of the cord set load protector design of FIG. 60 in a biased position.

  The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses.

  With reference to FIGS. 1 and 2, the exemplary power tool 10 includes a cord set load protector device 114 to prevent strong forces on the power cord 112 from affecting the connection of the cord 112 to the electrical power tool 10. Shown with. As shown in FIG. 1, the power tool 10 includes a cord 112 and a cord protector 114 extending from the rear end of the tool. The code protector 114 is mounted in a recess 116 provided in the power tool housing 118. The recess 116 can be square or curved in cross-section and has a cavity therein to receive the radially extending flange portion 120 of the elastomeric cord protector 114. Stipulate. A radially extending flange portion 120 is disposed relative to the shoulder portion 122. The crimping device 124 includes a radially extending flange portion 126 that is clamped or crimped onto the power cord 112 and disposed within the chamber 116 of the housing 118 relative to the distal portion of the cord protector 114. Including. The flange portion 126 is disposed against a shoulder 128 that extends radially inward of the cavity 116 provided in the housing 118.

  The crimping device 124 engages the power cord so as to be axially and rotatably fixed to the power cord 112 in a manner described in more detail herein. In a manner where additional cable length 112 a is provided in the housing between the crimping device 124 and the cord clamp 130, the power cord 112 is also attached to the tool housing by the cord clamp 130 provided in the power tool 10. Tightened. The cord clamp 130 can be attached to the housing by a fastener 132 or by other known fastening methods such as scissors, welding, grommets, and the like. The cord clamp 130 can be spaced from the recess 116 up to several inches. Positioning the cord clamp 130 further inwardly from the recess 116 reduces the cord stress from bending and stress on the cord for the clamp to two, usually both at the same location. The cord bending durability is improved by placing it at two different positions. This improves the flex life of the conductor.

  When a large force F is applied to the power cord 112, the power cord 112 is pulled in the axial direction of the force F, as shown in FIG. The movement of the power cord 112 relative to the housing 118 moves the crimping device 124 axially relative to the shoulder portion 128 such that the flange portion 126 of the crimping device 124 compresses the flange portion 120 of the cord protector 114. Thereby, the force exerted on the cord 112 is absorbed. The axial movement of the crimping device relative to the cord clamp 130 takes some additional cable length 112a provided therebetween without exerting a force on the cord clamp 130.

  The crimping device 124 can take many shapes. For example, as shown in FIGS. 4 and 6, the crimping device 124 can include a first clamp half 136 and a second clamp half 138. Each clamp half 136, 138 is each provided with a plurality of radially inwardly extending ribs 142 designed to engage and secure against the outer surface of the power cord 112. Provided by the body portion 140. The first clamp half 136 is provided with a plurality of apertures 144 that are each adapted to receive a plurality of corresponding locking fingers 146 provided to the second clamp half 138. Each of the first and second clamp halves 136, 138 includes a radial flange portion 126 a, 126 b that defines a radially extending flange portion 126 of the crimping device 124, respectively. The locking fingers 146 connect the second clamp half 138 to the first clamp half 136 in clamping engagement with the power cord 112 so as to prevent axial or rotational movement of the power cord 112 relative to the clamping device 124. Fix it. It should be understood that other clamp or crimp arrangements can be utilized by the cordset load protector 110 in accordance with the principles of the present disclosure.

  With reference to FIG. 7, an alternative cord set load protector 110 ′ includes a split clamping device 124 ′ received in a recess 302 in the handle portion 300 to prevent assembly from being twisted or pushed into the handle set. Indicates that it contains. The split clamp 124 'is independent of the handle set 300 and traps the complete cord set 112 and secondary wraps of filler strands. The cord protector 114 'includes an added material at the mounting end that prevents twisting and forms a spring to absorb the impact.

  In some embodiments, as shown in FIGS. 8-10, the cord set load protector 110 can comprise a plurality of biasing members, such as ribs, posts and / or springs, which are at least in part. , Extending within the housing to provide a shock absorbing function. In particular, the housing 118 can include two or more bias members 402 extending inwardly from the housing 118 (eg, three bias members 402 as shown). Each longitudinal axis of the bias member 402 may be orthogonal to the power cord 112 before the bias member 402 is deflected. Bias member 402 can be arranged to provide tortuous routing of power cord 112 through housing 118. However, it should be understood that other routing configurations can be used within the scope of the present teachings. In particular, as shown in FIG. 9, the bias members 402 can be arranged such that each is offset laterally with respect to the axis PC. The exact amount of this offset can be determined based on the characteristics of the power cord 112 and the physical characteristics of the bias member 402, as required by the cord set load protector 110.

  When under load (ie, in the form of a bias), the bias member / spring lever 402 can include form, material, and use other manufacturing methods that are directed to adjusting the corresponding response. It should be understood that it is possible. For example, in an embodiment, the bias member / spring lever 402 is non-cylindrical, for example, a taper, a notch, a planar, and / or a mold having a non-uniform cross-sectional shape. Or a formed member can be provided. This cross-sectional shape provides a non-linear response to allow for initial deflection under light loads and progressively less deflection under heavier loads when loaded Can do.

  Still referring to FIGS. 8-10, in some embodiments, the biasing member 402 of the cord set load protector 110 is sized and provided with a material to provide a predetermined compliance. Can be decided. For example, the bias member 402 can have a sufficient diameter to effect elastic deformation. Similarly, the bias member 402 can be made of a material that enables such elastic deformation. Still further, size and material combinations can be provided to achieve such elastic deformation. In addition, the biasing member 402 may be formed integrally with the housing 118, having the same material as the housing 118, or having a different material.

  During use, if sufficient force is applied to the power cord 112, the degree of serpentine shape is reduced (see progression steps in FIG. 9 (unbiased) and FIG. 10 (biased)). ), The corresponding force is transmitted to the bias member 402 to bias the bias member 402 in the direction. This deflection provides force absorption along axis PC.

  23-26, the biasing member 402 comprises a spring member that is operatively engaged with the power cord 112 to provide a biasing force to bias the power cord 112 into a serpentine configuration. It should be understood that In such an embodiment, the biasing member 402 comprises a spring member, which is one end of the housing 118 or other retaining structure 408 and a rotatable pulley 404 (FIGS. 25 and 26) or engaging member 406 ( 23 and 24) can be combined with the other end. A rotatable pulley 404 can be used to facilitate unconstrained transfer of the power cord 112 to the bias member 402. When such transfer of the power cord 112 is minimal, the engagement member 406 can be used. The bias member 402 comprises a spring member, which can include changing the spring rate relative to each other to enhance or adjust the desired bias shape.

  In some embodiments, as shown in FIGS. 11-15, the biasing member 402 can be a rib that extends inwardly from the opposite side of the housing 118 and, as it moves, to the power cord 112. The engagement plate 410 can be configured to engage a fixed combination. In particular, the engagement plate 410 can comprise a circular disc having an aperture 412 dimensioned to receive the power cord 112 therethrough. The engagement plate 410 can be held in place with respect to the power cord 112 via the contact portion clamp 414. In some embodiments, the abutment clamp 414 includes a U-shaped main member 416, a back-side retaining plate 418, and a back-side retaining plate 418 around the power cord 112 and its U-shaped main body as it moves. A plurality of fixtures 420 may be included that clamp and combine the members 416. It should be understood that the U-shaped main member 416 can be dimensioned to define an interference fit to the power cord 112 when the abutment clamp 414 is attached thereto. It should also be understood that alternative abutment clamps or retaining members can be used. Engagement plate 410 and abutment clamp 414 can be formed from a single, unitary member and can have a type of shape that is known to be properly engageable with biasing member 402. Should also be understood.

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11 to 15, it can be seen that the bias member 402 can be formed as a series of ribs having an orthogonal plane with respect to the power cord 112. To apply balance cord protection, the biasing member 402 can be disposed on the opposite surface of the power cord 112 or around the power cord 112. As described herein, the bias member 402 of the cord set load protector 110 can be sized and made from a material (or materials) to provide a predetermined degree of compliance. For example, the bias member 402 can have a constant thickness, a thickness that varies along its length, a thickness that varies with respect to other bias members, and is compliant with a compliant material or a predetermined bias shape. Made from a combination of these properties that allow elastic deformation. In addition, the bias members 402 are arranged relative to one another so that the first of the bias members 402 is biased and engages the second (and others) of the bias members 402 to provide a combined bias force. Can be done.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, which causes the engagement plate 410 and the abutment clamp 414 to be similarly transferred to the left side of the figure. . This transfer causes the engagement plate 410 to continuously engage the series of bias members 402 and so a corresponding force is transmitted to the bias member 402 to bias the bias member 402. This deflection provides force absorption along axis PC.

  In some embodiments, as shown in FIGS. 14 and 15, the abutment clamp 414 can comprise an elongated member that is associated with the power cord 112 as it moves. In this embodiment, the abutment clamp 414 can comprise a series of peripheral slots 422 that are dimensioned to receive the respective ends of the biasing member 402 therein. In this way, each of the plurality of bias members 402 can be simultaneously actuated or biased toward the initial movement of the power cord 102 along the axis PC. Thereby, it provides a generally linear bias response. As shown in FIG. 15, the abutment clamp 414 can be made from a flexible or elastomeric material to provide a bias to the bias member 402.

  In some embodiments, as shown in FIGS. 16-18, the biasing member 402 can be a rib that extends inwardly from the opposing surface of the housing 118 and a loop formed in the power cord 112. It can be arranged in the central part. That is, the bias member 402 can be formed as two or more ribs that can pass through the power cord 112. The biasing member 402 can have an arcuate shape that closely matches the predetermined loop radius of the power cord 112. It should be understood that the loop radius should be selected so as not to overload the power cord 112.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby exerting an inwardly directed compressive force on the bias member 402 and causing the bias member 402 to The first position (FIG. 17) is biased to the second position (FIG. 18). This deflection provides force absorption along axis PC.

  Referring now to FIGS. 19-22, in some embodiments, the biasing member 402 can comprise a member formed separately from the housing 118. For example, spring steel rings (FIGS. 19 and 20), elastomeric or compressible members (FIGS. 21 and 22), hollow sealing members or other energy absorbing members. In such an embodiment, the bias member 402 can be disposed at the inner corner of the housing 118. Thereby, when a force is applied to the power cord 112, such force is transferred to the bias member 402, thereby compressing the bias member 402 against the sidewall of the housing 118. In some embodiments, the housing 118 can include a contour 420 that receives the bias member 402 therein and holds the bias member 402 in a predetermined position. It should be understood that the biasing member 402 can be made from any material that provides sufficient elastic / compliant properties, such as spring steel, elastomers, and the like.

  Returning now to FIGS. 27 and 28, in some embodiments, the biasing member 402 can comprise a leaf spring 430. The leaf spring 430 can include a generally arcuate member made from a material sufficient to elastically bias the power cord 112 and provide a biasing force. In some embodiments, the leaf spring 430 is held at opposite ends 432 by a retaining member 434. The retaining member 434 can be fixedly coupled to the housing 118. It should be understood that in some embodiments, the retaining member 434 is dimensioned (see FIG. 28) to allow free slidable movement of the leaf spring 430 relative thereto. is there.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 will straighten, thereby exerting an upwardly directed force on the bias member 402 to the leaf spring 430. , And bias from the first position (FIG. 27) to the second position (FIG. 28). This deflection provides force absorption along axis PC.

  Returning now to FIGS. 29-31, in some example embodiments, the biasing member 402 can comprise a torsion spring member 436. In some embodiments, the torsion spring member 436 includes a torsion spring 437 that is retained at the end 438 by a retaining member 444. The retaining member 440 can be fixedly combined with the housing 118. The torsion spring member 436 can include a slot portion 442 formed therein for receiving and retaining the power cord 112.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 will straighten, thereby exerting a torsional force on the bias member 402 to the torsion spring member 436. From the first position (FIG. 29) to the second position (FIG. 30), the biasing force of the torsion spring 437 is rotated counterclockwise. This deflection provides force absorption along axis PC.

  With respect to FIGS. 32 and 33, in some embodiments, the biasing member 402 can comprise a biased tether system 450. The biased tether system 450 can include a biasing reel 452 that holds a tether 454. The tether 454 can include a coupler member 456 that is fixedly coupled to the power cord 112. The biased tether system can be arranged so that at least a portion thereof extends outside the housing 118. In such an embodiment, the aperture 458 is formed in the housing 118 to allow the tether 454 to pass therethrough.

  The bias reel 452 can be a spring that is biased to provide a pulling force on the power cord 112. In this regard, during use, if sufficient force is applied to the power cord 112, the power cord 112 will straighten, thereby informing the bias reel 452 that it will exert a force on the tether 454. It is done. Such a force causes the bias reel 452 to rotate clockwise in the figure with respect to the bias force from the first position (FIG. 32) to the second position (FIG. 33). This deflection provides force absorption along axis PC.

  Referring now to FIGS. 34 and 35, in some embodiments, the biasing member 402 can comprise a piston device 510, at least in part, to provide a shock absorbing function. In particular, in some embodiments, the piston device 510 can be disposed within the housing 118 or, in some embodiments, can be formed outside the housing 118. With particular reference to FIGS. 34 and 35, the piston device 510 can include a piston member 512 slidably disposed within the piston chamber 514. The piston member 512 can define a seal between the piston member 512 and the piston chamber 514 to create a compressible pressure volume 516. The piston member 512 can include a rod 518 that is fixedly associated with the cord clamp 130. It is then fixedly combined in turn with a power cord 112 that moves with it. The piston chamber 514 can be fixedly coupled to the housing 118 or can be integrally formed therewith. In some embodiments, the piston chamber 514 can be held by a retainer structure (not shown) that is separate from the housing 118.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby similarly transferring the piston member 512 to the piston chamber 514 on the left side of the figure. This transfer causes the piston member 512 to compress a fluid, such as air, gas, or liquid, in the pressure chamber 516, thereby creating a counter biasing force. This compression of the fluid in pressure chamber 516 provides force absorption along axis PC at an increasing rate.

  36 and 37, in some embodiments, the piston device 510 is disposed within the housing 118 such that the piston member 512 slidably engages the piston chamber 514. Can do. The piston chamber 514 is formed as part of the housing 118 such that the piston member 512 forms a seal therewith and slidably engages the inner wall of the housing 118 to define a compressible pressure volume 516. Can be done. As the piston member 512 moves, the piston member 512 is directly and fixedly combined with the power cord 112. In some embodiments, the piston member 512 can include one or more orifice channels 530 extending therethrough. Orifice channel 530 can provide a regulated flow of fluid (ie, air) from compressible pressure volume 516 to atmosphere. In other words, the orifice channel 530 is sized to allow the desired bias shape to be generated at a predetermined rate of fluid exhaust. In some embodiments, the orifice plate 532 can be disposed in the housing 118. Then, a retaining feature 534 formed in the housing 118 is engaged, which defines a compressible pressure volume 516. Orifice plate 532 is formed into and through compressible pressure volume 516 to further enhance and regulate the regulated flow of fluid (ie, air). The above orifice channel 530 can be provided.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred. As a result, the piston member 512 is similarly transferred to the piston chamber 514 on the left side of the figure. This transfer causes the piston member 512 to compress a fluid, such as air, gas or liquid, in the pressure chamber 516. This creates a counter bias force. This compression of the fluid in pressure chamber 516 provides force absorption along axis PC at an increasing rate.

  In some embodiments, the cord set load protector 110 can comprise a spring lever assembly 600, as shown in FIGS. In some embodiments, the spring lever assembly 600 can include a spring lever 602 and a cord clamp 130 that is fixedly coupled to the spring lever 602 and the power cord 112. As shown in FIGS. 38-46, the spring lever 602 can be fixedly coupled to the housing 118 via one or more retaining members 604 extending from the housing 118. In particular, the spring lever 602 can include a plurality of corresponding mounting apertures 606 (see FIG. 45) dimensioned to receive the retaining member 606 therethrough. In some embodiments, for example, retaining via spring staking or welding to permanently hold the spring lever 602 in a predetermined operable position (see FIG. 44). Member 604 can be deformable. The retaining member 604 can be spaced apart to define a plane extending between its centers. Here, the plane is usually perpendicular to the longitudinal axis of the power cord 112. In addition, the retaining member 604 can be a sleeve or slot formed in the housing 118 that receives and holds the end of the spring lever 602.

  In some embodiments, the cord set load protector 110 can include a cord clamp 608 that is fixedly coupled to the spring lever 602. In some embodiments, as shown in FIGS. 38-46, the cord clamp 608 includes a pair of clamping members 610 that are suitable for being combined together via a fastener 612 (FIG. 44). Can do. In particular, each clamping member 610 includes an enlarged aperture 614 and a threaded aperture 616 that threadably engages the fixture 612 to allow a shank portion of the fixture 612 to pass therethrough. Can do. Each clamping member 610 can include a slot 618 formed therein for capturing the side of the spring lever 602 and a generally circular portion 620 for capturing the power cord 112. Thus, the cord clamp 608 can be attached to the end of the spring lever 602 such that the slot 618 of each clamping member 610 engages the side of the spring lever 602. Similarly, the power cord 112 can extend between the clamping members 610. By tightening the fixture 612, the clamping member 610 is pulled together to exert a clamping and retaining force on both the spring lever 602 and the power cord 112. As described above, the cord clamp 608 is fixedly combined with the power cord 112 in accordance with the movement thereof. It should be understood that the clamping member 610 is configured such that a single manufacturing piece can be used for the opposing surfaces of the spring lever 602.

  With respect to FIG. 45, the spring lever 602 can include a slotted end 622 that receives the power cord 112 therethrough.

  During use, if sufficient force is applied to the power cord 112, the corresponding force is between the relaxed position (FIGS. 38, 40, 42 and 44) and the biased position (FIGS. 39, 41 and 43). Is transmitted through the cord clamp 608 and to the spring lever 602 to bias the spring lever 602. This deflection provides force absorption along axis PC. The biasing force of the spring lever 602 can be determined based in part on the size and length of the spring lever 602 and its material. However, it should be understood that in some embodiments, additional biasing force can be required. In such cases, an additional spring member 630 (FIGS. 40 and 41) can be used disposed between the cord clamp 608 and the housing 118. The additional spring 630 may be a compression spring having a linear or progressive spring rate. In addition, additional spring members 630 include coil springs, torsion springs, elastomeric members, and the like. The spring member 630 may be disposed coaxially with the power cord 112 so as to maintain the alignment of the spring member 630 with the power cord 112. It should be understood that the spring member 630 can be used separately from the spring lever 602, for example as shown in FIGS.

In some embodiments, as shown in FIGS. 42 and 43, the spring lever 602 is pivoted between a relaxed position (FIG. 42) and a biased position (FIG. 43) so that it is centered about the axis 650. Can be pivoted. In this embodiment, torsion spring 652 can be used to apply a biasing force against power cord 112 when under load.

  In some embodiments, a bellmouth 634 can be used to limit the deflection of the power cord 112 exiting the housing 118. The bellmouth 634 can include a generally linear body portion 636 and a bent outlet 638 having a bent shape. The bell mouth 634 can be fixedly coupled to the cord clamp 608 as it moves with the cord clamp 608 when the power cord 112 is under load.

  49-52, in some embodiments, the bias system 710 can comprise a plunger member 712 that is slidably disposed in the housing 118. In some embodiments, the plunger member 712 can be slidably disposed within the housing 118 or disposed within a plunger chamber 713 formed as part of the housing 118. The plunger chamber 120 may be formed integrally with the housing 118 and so is only part of the housing 118 or away from the housing 118 to form a subassembly that is positionable within the housing 118. It should be understood that it can be formed.

  The plunger member 712 is fixedly combined with the power cord 112 according to the movement of the plunger member 712 using the coupling member 714. The coupling member 714 can be formed in any shape that allows the plunger member 712 to be connected to the power cord 112 as it moves. In some embodiments, the coupling member 714 can comprise a clamping bracket having opposing surfaces that are threaded together through a fixture to apply a clamping force to the power cord 112. . As required, compressible volume 716 is thus defined by plunger chamber 713, plunger member 712, and any other portion of housing 118.

  In some embodiments, as shown in FIGS. 49 and 50, the compressible volume 716 can comprise a biasing medium 718 disposed therein. The bias medium 718 can include a plurality of elastomeric members formed as balls, beads, pebbles, or various random shapes. This biasing medium is free in the compressible volume 716 to be piled, stacked or grouped in response to the movement of the plunger member 712. Can be set. That is, the biasing medium 718 can be free to move or move within the initially compressible volume 716 and yet be restrained in a biased position.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby similarly transferring the plunger member 712 relative to the plunger chamber 713 on the left side of the figure. This transfer causes the plunger member 712 to compress the bias medium 718 against the wall of the plunger chamber 713. This causes the opposing biasing force of the biasing medium 718 being compressed against the wall of the plunger chamber 713 to create a countering biasing force against the movement of the power cord 112 along the axis PC. To do. The spring rate of this opposing bias force can be adjusted to a predetermined bias shape through selection of the bias medium, including selection of materials used, medium size, medium amount, and the like. It should be understood that a mixture of different media can be used.

  In some embodiments, as shown in FIGS. 51 and 52, the spring coil member 720 is combined between the housing 118 and the plunger member 712 to provide a biasing force against the plunger member 712. be able to. In some embodiments, the spring coil member 720 has a first end 722 that is fixedly coupled to the housing 118 and an opposite second end 724 that is fixedly combined with the plunger member 712. A spring coil. The spring coil member 720 can extend through portions of the plunger member 712 and the coupling member 714 to be combined with the surface 726 of the plunger member 712. However, it should be understood that the spring coil member 720 can be fixedly coupled to the plunger member 712 or the back surface 728 of the coupling member 714.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby similarly transferring the plunger member 712 relative to the plunger chamber 713 on the left side of the figure. This transfer causes the plunger member 712 to pull the second end 724 of the spring coil member 720. This straightens the spring coil member 720 creating a biasing force that opposes the movement of the power cord 112 along the axis PC. The spring rate of the opposing biasing force can be adjusted to a predetermined bias shape through the selection of the material and the spring characteristics of the spring coil member 720.

  In some embodiments, the spring cam lever 726 can be combined with the housing 118, as shown in FIGS. The spring cam lever 726 can be a generally planar lever having an end 728 facing upward. The retaining end 730 of the spring cam lever 726 can be fixedly coupled to the housing 118 via a retaining feature 732 extending from the housing 118. Retaining feature 732 can include a molded-in feature, such as a sleeve, to retain retaining end 730 therein via an interference fit or other connection. Plunger member 712 can have a raised cam configuration 734 extending from its side and can be slidably disposed in guide slot 736. The raised cam configuration 734 can be configured to engage and gradually bias the spring cam lever 726 in response to the movement of the power cord 112 and plunger member 712.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby similarly transferring the plunger member 712 relative to the guide slot 736 on the left side of the figure. This transfer causes the raised cam form 734 to move along the spring cam lever 726 from the end 728 facing upwards to hold the end 730. As a result of the position in the immediate vicinity of the raised cam configuration 734 relative to the spring cam lever 726, the spring cam lever 726 gradually bends from an initial position to a biased position. This creates a biasing force that opposes the movement of the power cord 112 along the axis PC. The spring rate of the opposing bias force can be adjusted to a predetermined bias shape through the selection of the material and the spring characteristics of the spring cam lever 726.

  In some embodiments, as shown in FIGS. 55 and 56, the cord set load protector 110 can include a breakaway connector 800. Breaker connector 800 can include a first cord half 802 and a second cord half 804 that extend from the first cord half 802 and / or the second cord half 804. Electrical connection is possible via the connector 806 and a female end connector 808 disposed in the first cord half 802 and / or the second cord half 804. Male end connector 806 and female end connector 808 can be configured to define electrical and mechanical connections. There, the mechanical connection can be disconnected in response to a predetermined load applied along the power cord 112. Once this predetermined load is reached, the mechanical connection is disconnected, thereby disconnecting the electrical connection. This predetermined load (ie, the retaining force) can be selected to be less than a known load that can cause damage to the power cord 112. The tether member 810 can be used to connect the first cord half 802 and the second cord half 804. Thereby, once the predetermined load is reached and the mechanical connection is disconnected, the tether member 810 will connect the first cord half 802 and the second cord half 804 close together for reconnection. Can be held. The tether member 810 can be a strap member that combines the first cord half 802 and the second cord half 804 via a fastener. The tether member 810 can be configured to provide the ability to carry a greater load than the mechanical connection between the first cord half 802 and the second cord half 804.

  Referring now to FIGS. 57-61, in some embodiments, the cord set load protector 110 can comprise a biased cam assembly 900. In particular, in some embodiments, the biased cam assembly 900 can be disposed within the housing 118 or, in some embodiments, formed outside the housing 118. it can. With particular reference to FIG. 16, the biased cam assembly 900 can include a cam follower bracket 910, a cord clamp bracket 912, and a bias member 914. In some embodiments, the cam follower bracket includes a body portion 916 having one or more cam slots 918. Each cam slot 918 is then sized to receive a cam follower 920 (ie, a fixture) extending therethrough. Cam follower 920 and cam slot 918 are sized to fit closely together to provide unconstrained cam movement. Cam follower 920 is configured to be threadedly received in a mounting structure 922 extending from housing 118 or other equivalent support structure.

  In some embodiments, the cord clamp bracket 912 is clamped to compensate for and between the corresponding second power cord retention slots 926 formed on the cam follower bracket 910 (FIGS. 58-61). A bracket body can be provided that is shaped to include a first power cord retention slot 924 that is sized to engage and retain the power cord 112. In this way, the cam follower bracket 910 can be moved together with the power cord 112.

  In some embodiments, the cord clamp bracket 912 includes a pair of enlarged apertures 928 that allow a shank portion of the fixture 930 to pass through corresponding threaded apertures 932 formed in the cam follower bracket 910. be able to. By tightening the fixture 930, the cord clamp bracket 912 is pulled toward the cam follower bracket 910 to exert a clamping and holding force on the power cord 112. As described above, the cord clamp bracket 912 is fixedly combined with the power cord 112 in accordance with the movement thereof.

  With continued reference to FIGS. 57-59, the bias member 914 is positioned between the cam follower bracket 910 and the housing 118 such that movement of the cam follower bracket 910 to the left in the figure exerts a compressive force on the bias member 914. Can be arranged. In particular, in some embodiments, the bias member 914 can be positioned such that the end of the bias member 914 engages the sidewall of the housing 118 or, more particularly, the sidewall of the mounting structure 922. The opposite end of the bias member 914 can be arranged to engage the spring wall 934.

  Variations of the biased cam assembly 900 can exist, for example, such that one end engages the sidewall of the housing 118 and the opposite end engages at least a portion of the cord clamp bracket 912. In addition, it should be understood that the bias member 914 can be disposed. In this manner, the bias member 914 can be disposed in a coaxial relationship with the power cord 112.

  During use, if sufficient force is applied to the power cord 112, the power cord 112 is transferred, thereby similarly transferring the cam follower bracket 910 to the left side of the figure. Cam follower 920 slides into cam slot 918 to provide a smooth, unconstrained deflection. This transfer causes the biasing member 914 to compress, thereby creating an opposing biasing force. This compression of the bias member 914 provides force absorption along the axis PC.

  It should be understood from the foregoing that one or more of the disclosed embodiments may be used to provide improved adjustment of bias shape and increased code protection at the same time.

Claims (50)

A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector operably engaged with the power cord;
The cord protector includes at least one elastically deformable biasing member that engages the power cord and exerts a biasing force on the power cord against a load applied to the power cord;
The power tool, wherein the bias member returns to an initial position for removal of the load. The cord protector includes a plurality of bias members extending from the housing,
The power tool according to claim 1, wherein the plurality of bias members are deflectable between an initial position and a biased position. The plurality of bias members are offset along an axis of the power cord;
The power tool according to claim 2, wherein the power cord is routed around the plurality of bias members to define a serpentine pattern.   4. The clamping member according to claim 3, further comprising a clamping member for combining a part of the power cord with the housing so that the plurality of bias members are deflected to the biased position when the load is applied to the power cord. Power tools.   The power tool of claim 1, wherein the at least one bias member is an elongated member.   The power tool according to claim 5, wherein the elongated member is cylindrical.   The power tool according to claim 5, wherein the elongated member is non-uniform. The at least one bias member is an extension spring;
The power tool according to claim 1, wherein the extension spring has one end combined with the housing and an opposite end engaged with the power cord. An engagement plate fixedly coupled to the power cord;
The power tool according to claim 1, wherein the engagement plate is engaged with the at least one bias member. The cord protector includes a plurality of bias members extending from the housing,
The power tool according to claim 9, wherein the plurality of bias members are arranged in a radial direction around an axis of the power cord.   The power tool according to claim 10, wherein the engagement plate is engaged with at least two of the plurality of bias members continuously with respect to the load.   The power tool according to claim 10, wherein the engagement plate engages with at least two of the plurality of bias members simultaneously with respect to the load. The cord protector includes a plurality of bias members extending from the housing,
The power tool according to claim 1, wherein the plurality of bias members are deflectable radially inward between an initial position and a biased position.   The power tool according to claim 13, wherein the power cord is arranged in a circle around the plurality of bias members.   The power tool according to claim 1, wherein the bias member is a spherical member disposed between the power cord and the housing. The at least one bias member is a leaf spring;
The power tool according to claim 1, wherein the leaf spring is slidably combined with the housing at an opposite end. The at least one bias member is a torsion spring;
The power tool according to claim 1, wherein the torsion spring is fixedly combined with the housing at one end.   The power tool according to claim 1, further comprising a tether that operably combines the power cord and the bias member. The biasing member is a piston device;
The piston device comprises a piston member and a piston chamber;
The piston member is fixedly associated with the power cord and is slidably disposed in the piston chamber to define a compressible pressure volume;
The power tool of claim 1, wherein the compressible pressure volume outputs a biasing force that opposes the load. Further comprising an orifice channel extending through at least one of the piston member and the piston chamber;
The power tool of claim 19, wherein the orifice channel fluidly combines the compressible pressure volume with an atmosphere. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector operably engaged with the power cord;
The cord protector includes a spring lever member that is combined with the housing at a first end and engaged with the power cord at a second end;
The spring lever exerts a biasing force on the power cord with respect to a load applied to the power cord; and
The power tool, wherein the spring lever returns to an initial position for removal of the load.   The power tool according to claim 21, further comprising a cord clamp that fixedly couples the second end of the spring lever to the power cord. The cord clamp includes a pair of clamping members,
The power tool according to claim 22, wherein each of the pair of clamping members includes a first slot that engages with the spring lever and a second slot that engages with the power cord. A spring member disposed between the spring lever and the housing;
The power tool according to claim 21, wherein the spring member exerts a biasing force on at least one of the power cord and the spring lever.   The power tool according to claim 24, wherein the spring member is coaxial with the power cord.   The power tool of claim 21, wherein the spring lever is coupled to the housing at the first end via thermal staking. The spring lever is pivotally coupled to the housing at the first end;
The power tool according to claim 21, further comprising a torsion spring biasing the spring lever to the initial position. Further comprising a bell mouth member fixedly combined with the cord protector,
The power tool according to claim 21, wherein the bell mouth member has a bell-shaped portion and is formed to be received through the power cord.   The power tool of claim 21, wherein the spring lever provides a non-uniform biasing force. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector operably engaged with the power cord;
The cord protector includes a spring member engaged with the housing at a first end and engaged with the power cord at a second end;
The spring member exerts a biasing force on the power cord with respect to a load applied to the power cord; and
The power tool, wherein the spring member returns to an initial position for removal of the load.   31. The power tool according to claim 30, further comprising a cord clamp engaging the second end of the spring member and the power cord.   The power tool according to claim 30, wherein the spring member is coaxial with the power cord. Further comprising a bell mouth member fixedly combined with the cord protector,
The power tool according to claim 30, wherein the bell mouth member has a bell-shaped portion and is formed to be received through the power cord.   32. The power tool of claim 30, wherein the spring member provides a non-uniform biasing force. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector that can be combined with the power cord so as to be operable with movement, and
The cord protector comprises a cam follower bracket having a cam slot,
The cam slot is dimensioned to receive a cam follower;
The power follower bracket is biased to an initial position and biasing the power cord with respect to a load applied to the power cord. The cord protector further includes a cord clamp bracket that is fixedly combined with the cam follower bracket,
36. The power tool of claim 35, wherein the cord clamp bracket and the cam follower bracket both clamp and engage and hold the power cord.   36. The power tool of claim 35, wherein the cam follower includes a fixture that extends slidably through the camming slot and is threadably engaged with the housing. Further comprising a biasing member biasing the cam follower bracket at the initial position;
36. The power tool of claim 35, wherein the biasing member returns to the initial position for removal of the load.   39. The power tool according to claim 38, wherein the biasing member is disposed between the housing and the cam follower bracket.   39. The power tool according to claim 38, wherein the bias member is disposed between the housing and a spring wall formed on the cam follower bracket.   The power tool according to claim 38, wherein the bias member is disposed coaxially with the power cord. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector having a plunger member slidably disposed in the chamber;
The plunger member is fixedly combined with the power cord,
The chamber has a biasing medium disposed therein and typically compressible with respect to movement of the plunger member relative to the chamber;
The power tool, wherein the bias medium exerts a biasing force on the power cord with respect to a load applied to the power cord.   43. The power tool of claim 42, wherein the biasing medium comprises a plurality of elastomeric members.   44. The power tool of claim 43, wherein the plurality of elastomeric members are non-uniform.   43. The power tool of claim 42, wherein the biasing medium is freely movable in the chamber in an initial position and is generally constrained in the chamber in a biased position. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector having a plunger member slidably disposed in the chamber;
The plunger member is fixedly combined with the power cord,
A spring coil member operably combining the plunger member and the housing to provide a biasing force to the plunger member in response to movement of the plunger member relative to the chamber;
The power tool, wherein the bias force opposes a load applied to the power cord. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor;
A cord protector comprising a plunger member slidably disposed within the chamber;
A spring cam lever fixedly combined with the housing at one end;
The plunger member has a cam configuration extending therefrom;
The cam configuration engages the spring cam lever and gradually biases it to provide an increased biasing force on the plunger member relative to movement of the plunger member relative to the chamber;
The power tool, wherein the bias force opposes a load applied to the power cord. A tool body having a housing;
A motor disposed in the housing;
A power cord connected to the motor,
The power cord has a breakaway part,
The breakerway portion has a first half and a second half that are releasably combined and define a retaining force;
The breaker portion is separable for loads greater than the retaining force;
The power tool, wherein the retaining force is less than a known load that damages the power cord. A tether member that fixedly combines the first half and the second half of the power cord;
49. The power tool according to claim 48, wherein the tether member holds the first half and the second half after separation of the breakerway portion. The tether member defines the force of the tether holding the half first half and the second half;
50. The power tool of claim 49, wherein the tether force is greater than the retaining force.

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